300 PRC update

Rocketmandb

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Another range report, this time with fire formed 8x68S:

The last time I went to the range to test out 8x68S brass that had been fire formed, it was a bit of a bust because, even though I lowered the powder load to accommodate for the thicker brass, it fired a lot hotter than I thought it would. I'm going to the private range on Saturday to run a ladder test, but I went to the local 100 yard range this evening to break in the barrel on my brand new 6mm BRA - so I figured I'd play around with 4 loads of RL 26 in 8x68S with my 300 while I was there.

I ran 4 groups at 72, 72.5, 73 and 73.5 grains of RL 26 with 225 pills.

The 72 grain group was poor, with a relatively large ES/SD and poor group. It averaged 2843 fps.

The 72.5 and 73 grain groups were both excellent. The ES on the 72.5 gr group was 7 and the SD 4.2. On the 73 it was 10/8.0. Both groups were essentially each one big hole. The 72.5 average was 2870 fps and the 73 was 2879 fps, which is closer than they should be on a linear comparison, leading me to believe that the sweet spot lies in this range. The ladder test will hopefully confirm.

Not coincidentally, this is the same fps range where my 76.2 gr of H1000 is performing best in Hornady brass.

Long story short: the 8x68S brass is performing well, and I haven't even dialed it in yet.
 

twh30

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Can someone help this newbie idiot? AI AICS chassis and magazine, Bighorn TL3 magnum bolt and bolt face. The bolt is sliding over the round and not chambering. I'm assuming it has something to do with the feed lips but I haven't been in the game long enough to know.

300 PRC in an AICS 300 Win Mag magazine
 

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b6graham

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Can someone help this newbie idiot? AI AICS chassis and magazine, Bighorn TL3 magnum bolt and bolt face. The bolt is sliding over the round and not chambering. I'm assuming it has something to do with the feed lips but I haven't been in the game long enough to know.

300 PRC in an AICS 300 Win Mag magazine
send picture with mag inserted. from the rear. bolt removed. that shows primer height
 

Markol

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Thinking of using the 300PRC as a suppressed hunting rig. Seems that it really needs a long barrel to take advantage of a full powder burn, has anyone tried a 22” barrel suppressed? Those that are really familiar with this caliber, what your best guess? 2800 FPS?
I'll be getting running a 26" barrel suppressed later this month or next and will get back to you.
 

Markol

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Thought I’d try some PRC KoolAid and see how I like it; so I ordered a new magnum RPR. The brass prep for my MK13 is laborious to say the least, but I wasn’t gonna rebarrel a good shooting 300WM just yet. Hoping to significantly cut down reloading time with this new rifle. I’d love to shave some weight off that 15lb Ruger. Proof is making the barrels, but I can’t find anyone making aftermarket handguards. Was hoping someone could weigh in that has tracked down a company making them. I’m not above installing the 24” Proof and cutting down the factory handguard but will save that option till last 😂
How's the RPR in .300PRC? I'm going to buy one once I sell my .308 and get some money saved up.
 

car16smg

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For the money, it’s a great gun. I was zero’d and shooting 1 MOA five-shot groups at 1250yd with factory 225 ELD-M ammo in no time flat. Got MV (2840 average with 32 ES) while zeroing via LabRadar, and plugged bullet data into my Sig kilo ABS. I walked all the way out from 100, 500, 600, 750, 1000, then 1250 with the first box of ammo!!

Now the bad: factory muzzle brake weighs 15oz and looks hideous. Replaced with Surefire brake to allow use of 762RC. Handguard bushing has small tabs on the end toward the shooter that contact the scope rail. This would be fine if they were perfectly lined up; mine weren’t. The tabs had the scope rail in a bind and out of level. I removed the handguard and loosened the nut so the bushing could rotate. I lined everything back up and retorqued so everything is happy and straight. I will likely remove the tabs when I replace the factory barrel with a Proof 24” because this girl is hefty. Those are my only issues thus far. Only been to the range a couple times. Plan on getting to the 1700yd spot after the crops are out.

Hope this helps! Happy Thirsty Thursday!
 

Piper907

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@twh30
AICS and AX chassis magazines for the 300WM have different part numbers.
You need the AX specific ones... ask me how I know ;(
 

twh30

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@twh30
AICS and AX chassis magazines for the 300WM have different part numbers.
You need the AX specific ones... ask me how I know ;(
@Piper907 actually if that fixes the problem I'll be kind of pleased. This is just the magazine that came with the chassis. Will the AX 300WM seat properly in the AICS chassis without any modifications? And it fixes my problem?
 

Ledzep

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^^ Those are what I'm using and haven't had a problem so far. Mags/stock interactions can be finicky.
 

Coltonlrs

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Hey guy so I had Patriot Valley Arms build me a 300PRC and I have the flat line bullets does anyone has load data on what powders work best for the I currently have N560 and had some pretty descent groups but was wondering if anyone had luck with any other powders oh and by the way it’s a 26inch barrel and I’m getting 2950fps with hornady match 225gr eld m
 

jwknutson17

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Hey guy so I had Patriot Valley Arms build me a 300PRC and I have the flat line bullets does anyone has load data on what powders work best for the I currently have N560 and had some pretty descent groups but was wondering if anyone had luck with any other powders oh and by the way it’s a 26inch barrel and I’m getting 2950fps with hornady match 225gr eld m
Nice! What's the details on your 225 load?
 

gnochi

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Hey guy so I had Patriot Valley Arms build me a 300PRC and I have the flat line bullets does anyone has load data on what powders work best for the I currently have N560 and had some pretty descent groups but was wondering if anyone had luck with any other powders oh and by the way it’s a 26inch barrel and I’m getting 2950fps with hornady match 225gr eld m
Here’s the Flatline data (26in barrel, they also have a data sheet for 30in): https://www.warner-tool.com/wp-content/uploads/2019/04/300PRC_198Flatline_26inbbl.pdf
 

twh30

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From what I can see/decipher I see no primer at all.

I would try opening the feed lips some. But I'd also consider what tooley mentioned
Yep. Just ordered a new mag with a longer COAL that I think is going to work. I also only live about 15 minutes from @DAVETOOLEY so I'll probably drop the whole build off with him to make sure I'm good to go. He might be able to open the feed lips on that old mag to make it work.

Thanks for the input.
 

DAVETOOLEY

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Yep. Just ordered a new mag with a longer COAL that I think is going to work. I also only live about 15 minutes from @DAVETOOLEY so I'll probably drop the whole build off with him to make sure I'm good to go. He might be able to open the feed lips on that old mag to make it work.

Thanks for the input.
Oh hell somebody has found me.
Come on by.
 
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Supersubes

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Went out again today to do 208 and 225 eld pressure test with H1000. For the 208’s no sight adjustment was made from the last outing, but the barrel had been removed and fully cleaned. I dialed .3 up for the 225 test. Interesting how the 208 trends down through the charge escalation. .8” total vertical through the whole range. The 225’s had almost exactly .36” of vertical through the whole range.


C4EC40A4-139F-42F6-805D-F026EDE02F0E.jpeg

The my DTA bolt makes these little halo ejector marks even at the lowest charges. Here’s the high end of today’s loads. 208’s on top. No sticky bolt for any of these.
06EB5732-69AF-472E-96C8-F5A0A460185E.jpeg


Other than finding zero, I normally wouldn’t do any of this at 100 yds. 500 and beyond is more useful. With my day job schedule though, I’m a little squeezed for time to set the long range tests up.
 
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Markol

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Hope this helps! Happy Thirsty Thursday!
It sure does! I always shoot suppressed so I'm not worried about the muzzle device and the weight doesn't bother me either since I'll only be shooting it from a bench (or prone) and not lugging it around in the woods or anything. That's a little bit concerning about the tabs but it is a mass produced factory gun so these things happen-- at least it sounds like it was an easy fix. Thanks so much for the info, you've done basically exactly what I hope to. I'll be shooting factory ammo and really will only be using it beyond 1200yds which is why I don't want to dump a bunch of money into something custom. I only have access to that kind of range once a month at most but I can't get the .308 past 1400yds so it's time to start working on an upgrade!
 

DAVETOOLEY

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Went out again today to do 208 and 225 eld pressure test with H1000. For the 208’s no sight adjustment was made from the last outing, but the barrel had been removed and fully cleaned. I dialed .3 up for the 225 test. Interesting how the 208 trends down through the charge escalation. .8” total vertical through the whole range. The 225’s had almost exactly .36” of vertical through the whole range.


View attachment 7126848

The my DTA bolt makes these little halo ejector marks even at the lowest charges. Here’s the high end of today’s loads. 208’s on top. No sticky bolt for any of these.
View attachment 7126849


Other than finding zero, I normally wouldn’t do any of this at 100 yds. 500 and beyond is more useful. With my day job schedule though, I’m a little squeezed for time to set the long range tests up.
You've got ejector pin marks so you've exceed the yield point of the brass.
 

Supersubes

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You've got ejector pin marks so you've exceed the yield point of the brass.
Normally I’d agree, but everything does it, even the lowest starting charges and factory ammo.

There’s no expansion above the extractor groove until 78 gr with the 208, and 76 grains with the .225. The 208 load peaked at .0004 expansion, and the 225 load at .0006. Pretty soft loads by those measurements. Hodgdon considers max .0008. I’ll keep an eye on it though, and I dont plan on pushing past these charges I reached today.
 
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Supersubes

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Shot a narrow OCW test at 513 yards today. Probably should have gone wider on the charge range. It appears there’s a super wide velocity flat spot between 74 and 75 grains. On the last outing there was a 23fps spread between 74 and 75 grains(only single shots at each charge), and today it was 3 fps. Charges were double weighed, so not sure what happened, but that seems too close a spread. ES in the individual charges sucked for two of the three, which probably played into the low ES across the range. Since this was the first go round loading the fired cases, I learned that my neck bushing isnt small enough. The Hornady brass necks have a tapered wall thickness, and my .335 bushing doesn’t size them down enough to for a mandrel or expander ball to uniformly establish the ID. So the base of the neck is sized and gets kissed by my mandrel, but the top of the neck was oversized. So the necks are essentially funnel shaped on the ID. Neck tension was all over during seating. I have another bushing inbound.



3ECDD20D-376C-4341-A0CC-AE7A7C63E825.jpegCAE222E4-F99A-4982-893D-599B7BABF67D.jpeg

I loaded up 10 extra cases with br-2 and 215m primers(5 each).

Shot three of each at 777 yards. Ignore the group placement, as I adjusted to separate them. The second round of the BR2 load dropped low nearly to the 215m group.

BR-2 primer
A3D08D89-86A3-4856-BF57-6AEC34F83058.jpeg


215m primer
900C01F5-1FF5-4011-82F7-7A4BA7640F81.jpeg


I took the remaining two rounds of each primer and shot them at 897 yards with the same sight setting. One of these rounds didn’t read on the labradar, but the ES of the remaining three was 3 FPS.
60DB9760-530B-498D-B591-0BD0E6F99779.jpeg
 

jwknutson17

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Shot a narrow OCW test at 513 yards today. Probably should have gone wider on the charge range. It appears there’s a super wide velocity flat spot between 74 and 75 grains. On the last outing there was a 23fps spread between 74 and 75 grains(only single shots at each charge), and today it was 3 fps. Charges were double weighed, so not sure what happened, but that seems too close a spread. ES in the individual charges sucked for two of the three, which probably played into the low ES across the range. Since this was the first go round loading the fired cases, I learned that my neck bushing isnt small enough. The Hornady brass necks have a tapered wall thickness, and my .335 bushing doesn’t size them down enough to for a mandrel or expander ball to uniformly establish the ID. So the base of the neck is sized and gets kissed by my mandrel, but the top of the neck was oversized. So the necks are essentially funnel shaped on the ID. Neck tension was all over during seating. I have another bushing inbound.



View attachment 7127372View attachment 7127373

I loaded up 10 extra cases with br-2 and 215m primers(5 each).

Shot three of each at 777 yards. Ignore the group placement, as I adjusted to separate them. The second round of the BR2 load dropped low nearly to the 215m group.

BR-2 primer
View attachment 7127384


215m primer
View attachment 7127385


I took the remaining two rounds of each primer and shot them at 897 yards with the same sight setting. One of these rounds didn’t read on the labradar, but the ES of the remaining three was 3 FPS.
View attachment 7127386
What neck bushing did you order. I have inconsistent neck tension on the hornady brass. Curious what size you are going to. I'm also using that 335 bushing currently.
 
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waveslayer

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Shot a narrow OCW test at 513 yards today. Probably should have gone wider on the charge range. It appears there’s a super wide velocity flat spot between 74 and 75 grains. On the last outing there was a 23fps spread between 74 and 75 grains(only single shots at each charge), and today it was 3 fps. Charges were double weighed, so not sure what happened, but that seems too close a spread. ES in the individual charges sucked for two of the three, which probably played into the low ES across the range. Since this was the first go round loading the fired cases, I learned that my neck bushing isnt small enough. The Hornady brass necks have a tapered wall thickness, and my .335 bushing doesn’t size them down enough to for a mandrel or expander ball to uniformly establish the ID. So the base of the neck is sized and gets kissed by my mandrel, but the top of the neck was oversized. So the necks are essentially funnel shaped on the ID. Neck tension was all over during seating. I have another bushing inbound.



View attachment 7127372View attachment 7127373

I loaded up 10 extra cases with br-2 and 215m primers(5 each).

Shot three of each at 777 yards. Ignore the group placement, as I adjusted to separate them. The second round of the BR2 load dropped low nearly to the 215m group.

BR-2 primer
View attachment 7127384


215m primer
View attachment 7127385


I took the remaining two rounds of each primer and shot them at 897 yards with the same sight setting. One of these rounds didn’t read on the labradar, but the ES of the remaining three was 3 FPS.
View attachment 7127386
With all that testing, which primers did you decide to go with?
 

Supersubes

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With all that testing, which primers did you decide to go with?

Not a very comprehensive primer test at this point. So far so good. I’ve played with the BR-2’s in some magnums and super mags with good results in the past. I like the Br-2’s in general, and have a gazillion of them, so if they consistently work this winter in freezing conditions, i’ll use them. Still more tinkering to do.
 

Rocketmandb

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Not a very comprehensive primer test at this point. So far so good. I’ve played with the BR-2’s in some magnums and super mags with good results in the past. I like the Br-2’s in general, and have a gazillion of them, so if they consistently work this winter in freezing conditions, i’ll use them. Still more tinkering to do.
I've switched over to BR-2s for use with my RWS brass and RL 26 for my load development. I got better results with them on my 300 WM than I did with 215Ms. I lost a little velocity with them, but with RL 26, velocity is not a problem.

EDIT: I should note that I don't live in an area where I'll be doing cold-weather shooting.
 
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Sdvldog1371

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Having sticky bolt on reloads. Comes up fine but hard to get back without big effort. Case necks turned and trimmed to factory spec. Factory ammo runs great. Ideas?

I shot 100 rds of factory ammo and couldn't get it to group under an 1.5" at 100 more than once. Demilled 80 of them and measure powder and everything else. Powder had a swing of 2.4 grains high to low and an average of 74.6 grains of whatever was in there. Reloading I have had the same issue though. Neck turned, trimmed to hornady trim spec and the bolt cams over easy enough but it doesn't want to pull rearward. Also, for anyone who cares. I had a few cases that after the 1st firing had what appeared to be rust...iron oxide blotches on the cases.
FWIW, I spoke to Bergara this AM and they are using CIP length magazines in their HMR Pro 300PRC.
I spoke with bergara a couple days ago after I read this and they said their CIP bottom metal is still in R&D. I had bought a long action hmr pro stock as an Interim stock while manners defies the logic of time making my PRS-1. I would love a CIP bottom metal for my bergara stock...great stocks, have 3. Need to sell the long action or have it inlet for my badger m5 with CIP.
 

LakuNoc

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Anyone using Gunwerks Verdict Stock. Fully adjustable and weights only 2.6 LBS. I'm wondering if it will take CIP 3.850 magazines anyone?
 

Rocketmandb

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I had bought a long action hmr pro stock as an Interim stock while manners defies the logic of time making my PRS-1.
What's that?!?! Manners taking a long time to deliver a stock?!?! I'm stunned... they have a horrible reputation for this.

Still, a few weeks ago I got my new 6mm BRA, which has a PRS 2. That stock is going on every new rifle I get from here on out. A key selling point for me is the KMW Loggerhead cheek riser hardware, and the feature that allows the raised part to be offset to one side or the other. I went with Manners specifically because of this as I retrofitted one into my HS Precision stock on my 300 PRC.

Things I don't like - though I knew this from using a Loggerhead on my 300:
- The mechanism for tightening/loosening the riser requires an allen head wrench - it's not a thumb wheel. While this is one less thing to get in the way, it never really got in the way for me on any other rifle. It's also a pain to have to carry a tool to the range to do this.

- The riser uses a clip to keep its height. I don't like this, especially because I guess I've got high cheek bones that require the posts to be set higher than the tallest clip setting will allow. I'm in the process of designing a product to address this.

Those two issues are minor in comparison to the value the cheek riser provides from its offset feature.

Anyway, and applicable to this thread, I'm loving my 6mm BRA configuration so much, that I'm considering getting the exact same done in a new 300 PRC, matching the chamber to my current. Just considering... really, I'm just considering...
 
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b6graham

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What's that?!?! Manners taking a long time to deliver a stock?!?! I'm stunned... they have a horrible reputation for this.

Still, a few weeks ago I got my new 6mm BRA, which has a PRS 2. That stock is going on every new rifle I get from here on out. A key selling point for me is the KMW Loggerhead cheek riser hardware, and the feature that allows the raised part to be offset to one side or the other. I went with Manners specifically because of this as I retrofitted one into my HS Precision stock on my 300 PRC.

Things I don't like - though I knew this from using a Loggerhead on my 300:
- The mechanism for tightening/loosening the riser requires an allen head wrench - it's not a thumb wheel. While this is one less thing to get in the way, it never really got in the way for me on any other rifle. It's also a pain to have to carry a tool to the range to do this.

- The riser uses a clip to keep its height. I don't like this, especially because I guess I've got high cheek bones that require the posts to be set higher than the tallest clip setting will allow. I'm in the process of designing a product to address this.

Those two issues are minor in comparison to the value the cheek riser provides from its offset feature.

Anyway, and applicable to this thread, I'm loving my 6mm BRA configuration so much, that I'm considering getting the exact same done in a new 300 PRC, matching the chamber to my current. Just considering... really, I'm just considering...
KMW make longer posts for this very reason

the thumbwheel is worthless in my opinion. not enough leverage
 

Supersubes

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Anyone using Gunwerks Verdict Stock. Fully adjustable and weights only 2.6 LBS. I'm wondering if it will take CIP 3.850 magazines anyone?

I think you have the weight wrong. It’s 3.9lbs for carbon, and 4.4 for fiberglass. They have a number of bottom inlets, but their own bottom metal is set up for the the longer mags.
 

Coltonlrs

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Does anyone have load data for the 300 prc using N560 and 225gr eld match bullets looking for a safe starting point for load development
 

gnochi

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Does anyone have load data for the 300 prc using N560 and 225gr eld match bullets looking for a safe starting point for load development
VV doesn’t have 300 PRC data and Hornady doesn’t have VV data... terribly inconvenient.

As such, take this with a massive grain of salt and a less massive grain of powder:

CartridgeBulletPowderMinMax
300WM220 Scenar-LN56067.073.1
300WM230 Berger HTN56062.269.1
300NOR220 Scenar-LN56066.476.9
300NOR230 Berger HTN56067.175.9

Considering that the PRC case volume slots neatly between the WM and Norma Mag, and the bullet weight slots between the two options as well with a similar shape, I can state with reasonable confidence that the 67.1-69.1gr N560 range is safe, since all 4 of the bounding cases include that range.

I’d be inclined to start at 67.1 and very carefully and deliberately work up to pressure signs.
 
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Coltonlrs

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VV doesn’t have 300 PRC data and Hornady doesn’t have VV data... terribly inconvenient.

As such, take this with a massive grain of salt and a less massive grain of powder:

CartridgeBulletPowderMinMax
300WM220 Scenar-LN56067.073.1
300WM230 Berger HTN56062.269.1
300NOR220 Scenar-LN56066.476.9
300NOR230 Berger HTN56067.175.9

Considering that the PRC case volume slots neatly between the WM and Norma Mag, and the bullet weight slots between the two options as well with a similar shape, I can state with reasonable confidence that the 67.1-69.1gr N560 range is safe, since all 4 of the bounding cases include that range.

I’d be inclined to start at 67.1 and very carefully and deliberately work up to pressure signs.
Ok thank you for your help it’s crazy to that the round has been out for a year and there’s very little data out
 

Coltonlrs

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Thanks for the info. I saw some pretty inconsistent results with the latest batch of 225 eldm I shot. My original lot I was in the high single digits SDs and average half inch 5 round groups. Some more. Some less.

I was really thinking of a 29-30 inch barrel handloading the 230s hoping to get 3k+ fps. If I couldn't get it there, then it may not be worth it for me. Haven't seen it yet from anyone. I may be just sticking with the 26" and 215s.
Hey what powder are you using and do you have any data with N560 and the 225gr looking to start a load development
 

Supersubes

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What neck bushing did you order. I have inconsistent neck tension on the hornady brass. Curious what size you are going to. I'm also using that 335 bushing currently.
Just an update, the .334 worked well. Shot a bunch of groups today testing seating depth, and all loads combined (same charge weight, different seating depths) had an SD of 10.


Edit: Not super duper by any means, but very consistent across a wide range.

I had a mix of rounds left over so I shot them into one group. .020 to .040 jump.

4E7E3C50-CBE3-474F-9E57-136EA0B93833.jpeg
 
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Sdvldog1371

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Anyone running a 24" barrel that has stumbled upon an accurate load of 212 Eld-x, 225 Eld-m, 220 Eld-x, 230 A-tip or 250 A- tip? I know my mileage may vary but I'm looking for a better starting point. I would really like to find someone with quickload willing to run numbers to narrow it down, but any help at this point is appreciated. My normal load development procedures just aren't getting me there and I'm halfway convinced it's either the brass or it was the stock I had it in. Either way, something is a miss and hunting season is upon us. No more time to waste.

Oh and has anyone else been seeing bright orange blotches on their hornady brass after first firing? I've also had it on some cases after annealing. Those cases seem to be much tougher to size and mandrel expand too. This brass is just not great and for all of the ammo coming from the same lot...very inconsistent.
 

wspe1

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I was shooting the Hornady ELD in 243 win last saturday. I did note the inconsistencies with the ammunition as well. Hopefully, its not going to be a long term issue.